Means for fitting brake bands and linings



' 20, 1938.- M. E. HATCHMAN 7 2,140,580.

MEANS FOR FITTING -BRAKE BANDS'AND LININGS Filed Aug'. 17, 11934 2 Sheets-Sheet l muuni Dec; 20, 1938. EpHATCHMAN 4 MEANS FOR FITTING BRAKE BANDS AND LININGS Filed Aug. 17, 1934 2 Sheets-Sheet 2 -4mings are to be dressed: f

' Pat nt d Dee. 20,.1938

PATENT OFFICE I 2,140,580 I YMEANS FOR FITTING. Briana BANDS,

LININ Milton E. Hatchman, Chicago,

Application August 17,

1934, Serial Ne. 140 275 13 Claims. (01. 51-241) My invention relates-to means for fitting brake bands and linings for effective cooperation with the associated drums, and is particularly de signed for operation on the brakes of an auto- I g 4-, mobile. It is an object of my invention to provide in a device of this type a new and improved farm and arrangement of parts by which a'grind- 7 ing operation can be readily effected upon the outer faces of the brake linings, and by which the 1 it proper adjustment or: the parts may be'readily' determined and readily effected for assuring the proper grinding or the linings} f l It is one of the objects of my invention to pro vide an'improved device of this type'so conj structe-d and arranged as to be capable oi eflec tive use for eifecting the-'desired'grinding or the liningsafter such linings are attached in operative positionon the canithis result bangeritained' preferably by the use of grindingmeans adaptedto be revolved concentrically about the axle; It is accordingly one of the objects of my invention to provide improved means for mount-.

ing the required grindingrnechanism incen- 1 tered'position on the axle. I l f It is another object of my invention to pro :vide improved means for adjusting the grinding member toward and from the axle, preferably through the medium of a micrometer screw,

whereby the grindingmechanism may readily be advanced or retracted by the" desired number of thousandths of an inch, drainer suitablelunit of measurement, and then be brought back again to the original position if desired. 1

It is one of the objects of my invention to '35yprovide improve-d gauging means which can be setfirstto the desired position by application t0 the brake drum and can then be employed toadv'antage for the initial setting of the grinding mechanism by which the races or thebi ake 1m;

Itis anothr object of my inventionto impreve devices of this type in sundry details hereinafter T pointed out. The preferred means by which I have accomplished several objects arelillu'sv4, 5,trat'e'df in the drawings and are hereinafter spe cifically described. That" which I believe to be new; an d 'desire to cover by Letters Patent is set forthin the claims. .'In.ithe drawings Y T V I 50 Fig. 1 is a side face view. of my improved device, partly in section, showing the gauging means fin positionfor the initial adjustment of the grindingheadwith respect to the axis about which said head is to berotated;

55', Fig; 2 is a face view of myimprovedgauging means in the brake drum of a wheel, the drum being indicated diagrammatically by dotted lines;

Fig. 3 is a detail view,v being substantially a section taken at line 33 of, Fig.1;

Fig. 4 is a detail view upon an enlarged scale, 5 as seen at line 4:4 of Fig. 2;

Fig. 5 is'a view of my improved mechanism mounted upon an axle in position for grinding the brake linings fixed on the outer faces of the brake bands or shoes; 1

Fig. 6 is an enlarged detail view, partly in section, showing the construction and arrangement of the split sleeve which when fixed upon the axle serves as 'a bearing for the grinding mechanism; and 16 Figs. 7 and Bare cross sectional views taken at'line and -line'8-8 respectively of Fig. 6.

Referring nowlto the'several figures of the drawings, in which corresponding parts are indicated by the same reference characters, l0 and 0 H indicate two plates rotatably connected together, such connection in the construction shown beingeffec'ted through the: medium of a sleeve or oollari [2 extending. outwardly from one face of the plate II" and fitting snugly in a central 25 opening in the plate In which in the arrangement shown isiin the form of a ring. As is best shown in Fig. 2, the plate H is in the form of a spider having a central opening therethrcugh conforming to thejopening through the collar l2, the 30 plate H and collar I2 being formed integrally in the arrangement shown. Upon the outer ends of the arms provided by the spider form of the plate II, I have pivotally mounted three arms I 3, ligand l5 at points near their ends, the axes upon which said arms are mounted being located at the same distance from the axis upon which the plates l0 and II are rotatably connected, and being equally distributed about said Y axis; ,The' shorterend portions ofthe arms are 40 connected by means oflinks I 6, Hand l8 with the plate III, the three links being of the same length and" being connected with the plate In at points equidistant from the axis upon which ends of the arms are kept at all times at equal distances from the axis upon which the plates I0 and H are connected.

The connection between the arms and the links is effected in each instance by the use of a screw l9 having a thumb nut 20 thereon suitable for efiective manipulation for tightening the bolt by hand for holding the link and the arm from swinging with respect to each other. In the arrangement shown, a lock washer 2| is employed whereby effective pressure can beapplied between the arms and the links without com-. plete frictional locking of the parts together.

As is best shown in Fig. 4, the pivotal connections between the arms and the plate It is in each instance eflected by the use of a screw 22 which passes through an opening in the arm and has screw-threaded connection with the plate, such screw being held in position by means of a second screw 23 passing'through a portion of the plate H and having screw-threaded connection with the screw 22.

By my improved arrangement as above described, in which the pivotal connections of the parts is effected by special means for holding the parts in true centered position even when the connection is maintained loose enough for permitting relative movement of the connected parts, I have provided gauging means which is very accurate and which can be relied uponfor measuring accurately and quickly the size-of a drum'such as the brake drum 24 shown in dotted lines in Fig. 2. When the device as shown in Fig. 2 has been expanded for light contact of the arms with the face of the circular drum, and when the nuts 20 have then been tightened for holding the parts against further adjustment, the gauge can be readily removed from the drum ready for use as a pattern or templet as may b required. I

As is best shown in Figs. 1 and 3, the means for mounting my improved grinding mechanism upon an axle comprises a split sleeve 25 of bronze mounted within a casting 26 also in the form of a split sleeve having lugs 2! formed therewith connected by a machine screw 28 by which the cast sleeve 26 can be tightened about the split sleeve 25. At one side, the cast sleeve 26 is provided with a' slide box 29 extending longitudinally of the sleeve, in which is mounted a slide block 30 provided with a heavy bar 3! positioned radially with respect to the sleeve. In the construction shown, the slide block 30 is held in position by means of screws 32 adapted to be mounted in any one of a plurality of openings along the slide box, the arrangement being such that the bar 3| can be adjusted and held firmly in position through a considerable range longitudinally of the sleeve 26. 1

Upon the bar 3|, I have mounted a split bracket 33 the opposite side portions of which are connected by means of a machine screw 34 which when tightened holds the bracket in adjusted position longitudinally of the bar 3|. Upon the bracket 33, in turn, I have mounted a head 35 in the form of a casting having a sliding connection with the bracket. As is clearly shown in Fig. 1, the bracket 33 is provided with a lug36 which has screw-threadedconnection with a pin 31 which is rotatably mounted in the head 35 the arrangement being such that upon rotation of the pin 3! the head 35 is moved longitudinally of the bar, 3|. The pin 31 is provided with an enlarged head portion 38 upon which I have provideda series of graduations. In the preferred arrangement, the

threads on the pin 31 are arranged 40 to the driving shaft 40 having an aluminum grinding 7 head 41 mounted upon its outer end, such grinding head 4| being adapted to have an abradant surfacing means of any approved type mounted thereon.

'The means for mounting the grindingmechanism upon an axle comprises a split sleeve 42 of a size suitablefor a snug working fit within the bronze sleeve 25 above described. In preparation of an axle for reception of my improved grinding mechanism, split collets 43 and 44 are first placed lightly in position upon the axle, such as the axle 45 as shown in Fig. 6. The split sleeve 42 is then slid into position over thecollets, with the opening inthe wall of the sleeve loc ated oppositethe openings in the sides of the collets, as is best shown in Fig. 8. The sleeve 42 is then tightened about the collets, serving to tighten the collets also upon the axle 45, such tightening being effected by the use of a machine screw 46 rotatablymounted in the sleeve 42 at one side of 4 the opening and having screw-threaded connection with the opposite side portion. I have found that the size and shape of the axles of automo biles ordinarily in use are sufliciently uniform.

an axle by the use of the proper collet selected from a fairly small number of collets, not more than about 20 of such parts being required.

7 When a car is brought in for having its brakes ground, the wheel is first taken off and the drum on the Wheel is shaped and turned to true cylindrical form. The gauge is then inserted as shown in Fig. 2 and the nuts 20 are tightened for maintaining the arms in the desired expanded relation. The gauge is then set in position" in the split sleeve 25, the sleeveportion [2 of the gauge being of such size as to have in said sleeve. The micrometer screw arrangement 31, 38 is then set at zero, after which the screw 34 is loosened and the device as a whole is moved into position such that the grinding face of the head 4! is brought lightly into engagement with one of the arms of the gauge and the screw 34 is then tightened for holding the parts in the desired adjusted position. After the removal of the wheel, the'sleeve 42 is placed in position upon the axle and secured in position by tighteningthe screw 46 as above described. The micrometer gauge is then turned forproviding the desired anchor clearance, the amount of such clearance depending upon conditions known in advance in connection with diiferent cars. The, grinding mechanism is then placed in position as shown in Fig. 5, with the bronze sleeve 25 sliding into position upon the split sleeve 42 fixed'upon the axle of the car. The'gr'inding head 4! is then preferably given a complete revolution about'the axle, such revolution being effected with the brake shoes 41'and linings 48 retracted or drawn inwardlyto the limit of their movement, the spreading mechanism' for the shoes or bands'being entirely disconnected from the operating rods and levers if necessary for assuring the desired contraction of the parts. a In such revolution of the grinder head 4i about the shoes and'linings, the workman candeterminewhether or not the. shoes and linings are properly adjusted and can shape ,such parts by the use ofsuitable'tools'if the have become distorted inuse. After thejshoes and linings have been adjusted to approximately their trueshape,

" head. 'The motor '39 is then started and the de-I the axle serving to dressofi a very small portion I from the'outer faces or the linings. "Ifan inspecforexp'anding the shoes the required additional fthe'iconn'ections between" the shoe'spreading devices and the operating rods are adjusted for exlpandingthej shoes to a'slight extent" for bringing the linings lightly into 'co'ntact'with thegrinding amount. and a second revolution of the grinding mechanism with themotor operating can bemade iforflefiecting the desired accurate shaping of the shoes with respect to the drum.

While I prefer to'employ the form of mechanism, as above described, it 'is to be understood that my invention is not limited thereto except so far as theiclaims may be so limited by the prior art.

I I'claim: 7 51. In a mechanism of the type described, the

combination of a split sleeve, a split collet in each 7 end of the sleeve, means; for tightening the sleeve and the collets about an axle, a second sleeve rotatably mounted on said first named sleeve,

I a bar projecting from one side of said second sleeve substantially radially thereof, a head slidably mounted on said bar, and grinding means operatively mounted on said head.

j'y2. In a mechanism of the type described, the

combination of a split sleeve, a split collet in each end of the sleeve, means for tightening the sleeve and'the collets about'an axle, a second sleeve romounted on said bar, and grinding means opera tat'ably mounted on said first named sleeve, a

bar projecting from one side of said second sleeve substantially radially thereof and adjustable longitudinally of the sleeve, a head slidably tively mounted on saidhead.

' l 3. In a mechanism of the type described, the

rotatably mounting said bearing member in concentric position about an axle, a bar projecting j from one side of said bearing member substantially radially thereof, a bracket mounted on said bar' and held against rotary movement with respect to the bar but free to move longitudinally of the bar, means for holding said bracket in ad- ,.'justed position on said bar, a head mounted on 7' said bracket and adjustable thereon toward and from said bearing member, adjustable means for moving said head Withrespect to said bracket and holdingit in adjusted position, and grinding ,means operatively mounted on said head.

' 4. In a mechanism of the type described, the

combination of a bearing member adapted to be rotatab y. mounted on an axle, a bar projecting from one side of said bearing membersubstantially radially thereof, a bracket mounted on said bar, and'adjustable therealong, means for 1 thereon toward and from said bearing member,

holding said bracket in adjusted position on said bar, a head mounted on said bracket and slidable screw-threaded means for moving said head with respect; to said bracket and holding it inadjusted positiomandgrinding means operatively mounted on said head.

5.--In a mechanism of the type described, the combination of abearing member adapted to be rotatably mountedon an axle, a bar projecting from one-side of said bearing member substantially radially thereof, a bracket mounted on said banana adjustable therealong, means for holding said bracket in adjusted position on said bar, a 'head mounted on said bracket and slidable thereon toward and from said bearing member, a pin rotatably mounted in said head and held against longitudinal movement with respect thereto and having screw-threaded connection with said bracket for giving said head a movement longitudinally of the bar, scale and index means on said pin and said head for showing the distance through which said head moves with respect to the bracket, and grinding means operatively mounted on said head.

6. In a mechanism of the type described, the

combination of a split sleeve, means for tighteningsaid sleeve about an axle, a second split sleeve rotatably mounted on said first named sleeve, means for tightening said second split sleeve about said first named sleeve so as to have asnug working fit thereabout, a bar projecting from one side of said second sleeve substantially radially thereof, a head slidably mounted on said bar, and grinding means operatively mounted on said head.

'7. In a mechanism of the type described, the combination 'of a split sleeve, means for tightening said sleeve about an axle, a second split sleeve 'rotatably mounted on said first named sleeve, a third split sleeve mounted on said second sleeve, means for tightening said third sleeve on said second sleeve and serving to give said sec-- ond sleeve a snug working fit on said first sleeve, a bar mounted on said third sleeve in substantially radial position thereon, a head slidably mounted on said bar, and grinding means operatively mounted on said head.

8. In a mechanism of the type described, the combination of a bearing member, means for rotatably mounting said bearing member in concentric position about an axle, a bar mounted on said bearing member in radial position with respect thereto and movable transversely of the bar into adjusted position thereon, means for holding said bar in adjusted position with respect to the bearing member, a head slidably mounted on said bar, and grinding means operatively mounted on said head.

9. In a mechanism of the type described, the combination of a bearing member, means for rotatably mounting said bearing member in concentric position about an axle, a slide-box on one side face of said bearing member longitudinally thereof, a block slidably mounted in said slidebox, a bar of non-round shape mounted on said block in radial position with respect to said bearing member so as to be movable transversely of the bar into adjusted position with respect to the bearing member, means for clamping said block in adjusted position with respect to said bearing member, a head slidably mounted on said bar so as to be held against rotary movement with respect to the bar, means for holding said head in adjusted position with respect to said bar, and grinding means movably mounted on said head so as to be adjustable longitudinally of said bar toward and from said bearing member.

10. In a mechanism of the type described, the combination of a bearing member, means for rotatably mounting said bearing member in concentric position about an axle, a slide-box on one spect to the bar, means for holding said head inadjusted position with respect to said bar, grinding means movably mounted on said head so as to be adjustable longitudinally of said bar toward and from said bearing member, and screw-threaded connections between said grinding means and said head for holding the grinding means in adjusted position with respect to the head. 1

11. In a mechanism of the type described, the

combination of a sleeve, means for rotatably mounting said sleeve in concentric position about an axle, a slide box on one side face of said sleeve longitudinally thereof, a block slidably mounted in said slide box, a bar mounted on said block in substantially radial position with respect to said sleeve, a head slidably mounted on said bar,

' and grinding means operatively mounted on said head.

12. In a mechanism of the type described, the combination of a bearing member, means for rotatably mounting said bearing member in concentric position about an axle, a bar mounted on said bearing member in substantially radial position thereon, a head mounted on said bar so as to be adjustable toward and from said bearing member, an electric motor mounted on said head, and a grinding member mounted, on said'motor and rotatable about an axis at right angles to the axis of said bearing member.

13. In a mechanism of the type described, the

' combination of a bearing adapted to be rotatably mounted on an axle, a'bar projecting from one of, a bracket mounted on said bar and adjustable therealong, means for holding, said bracket in ad- MILTON E. HATCHMlAN.

,side of said bearing substantially radially there: 

